Teacher , Students and Numbers Logical Riddle

Below is a well known but a little twisted logical puzzle for a brain exercise. This would serve as a awesome teaser to your brain . 

A teacher think of two consecutive numbers between 1 to 10. (1 and 10 are included) Now teacher tells one number to each of his two students Jack and Mary. He also tells them that the numbers are consecutive and numbers are between 1 to 10.
Following Conversation takes place in students:

 Jack: I do not know your number.
Mary: I also do not know your number.
Jack: Now I know your number.

 Based on this conversation , there are only four possible pairs of numbers the two students could have.

1.__, __
2. __,__
3. __,__
4. __,__

 Can you find out what are these pair of numbers?

This is a level 3 , hence a difficult puzzle . It needs a brilliant logic to be solved , discuss it in comments then check the solution.

Video on Teacher, Students and Numbers Puzzle.

For solution of puzzle click link below :